Method of maintenance: test for heatThe winter has come to a season in which the heating system also malfunctions after a long period of time after it has ceased to be used. In some cases, anti-frozen fluids in a warm wind pipe are chronically non-frozen, condensed and blocked through the circulation of the pipe, which, while not affecting motor vehicles, is difficult to repair and must be repaired in a timely manner。Refrigerated fluids: t